Improvement in boring-machines



J. SWAN.

B ongfMachi'ne. No. 210,220. y '.Patepfe-d Noy.' 26, 187s.

fyi. 72

Alfuiimw li f I r4 l I N- PI'ES PHDTD-LITHOGRFHER, WASHINGTON. D. C.

UNITED STATES PATENT EEICEc` JAMES SWAN, on SEYMOUR, CONNECTICUT.

IMPROVE-MENT AIN BORING-MACHINES.

Specification forming part of Letters Patent No. 210,220, dated-November 26, 1878; application `filed` May 25, 1878.

To all whom it may concern: l

Beit known that I, JAMES SWAN, of Seymour, in the county of New Haven and State of Connecticut, have invented a new Improvement in Boring-Machines; and I do hereby declare the following, when taken in connection with the accompanying drawings andthe letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specication, and represent, in

Figurel, side view; Fig. 2, front view; Figs. 3, 4, and 5, detached views.

'This invention relates to improvements in boring-machines; and consists, chiefly, in the combination, with the driving-shaft and its bevel-gear, which sets in motion the augerspindle through a..bevelgear thereon, of a movable rack adapted to` engage the said bevel-gear on the said driving-shaft, whereby, by further rotation of the said driving-shaft and its bevel-gear in the direction of boring, the frame or carriage carrying the driving-shaft and auger-bit will be elevated.

A represents the base or bed of the machine; B, the auger-spindle, arranged in bearings G G on a vertical carriage, D, adapted to move up and down, the said carriage carr fing the drivingshaft E,on which is placed the auger-driving bevel pinion or gear F, which engages a bevel-pinion,l Gr, on, and rotates the auger-spindle as, the driving-shaft is rotated by the cranks H.

The carriage D has an arm,^]?, extended backward into-the open side of the case N, and the said arm is bored to form a sleeve or eye, p, to t the spindle L placed in the said case, the sides of thearm I? bearing on the cheeks It, which act as guides to govern the movement of the carriage D. Fitting the sleeve or eye of the arm P upon this spindle L, as described, enables the carriage to bc guided with less friction and to be constructed cheaper than if the arm extended backward from the carriage had a long cylindrical block fitted to a cylindrically-bored passage in the case or standard, as heretofore common.

To withdraw the auger from the hole which it has bored, I have provided a toothed rack, S, pivoted at one side of the case, so that it may be turned to one side, (see dotted lines, Fig. 3,) and engage the bevel-teeth ofthe auger-driving pinion F on the driving-shaft, in which position further rotation of the shaft E in the direction of boring will cause the bevel-pinion F to travel upward along the rack and elevate the auger.

When the rack S is turned to engage the pinion F, as seen in broken lines, Fig. 3, a

projection, dit, at its lower end (see Fig. l) falls into a corresponding notch in the lower bearing, and locks the rack in connection with the pinion. When it is again desiredto cause theauger todescend, the shaft E is partially reversed, which causes the pinion F to lift or unlock the rack-projection dit, after which the v rack S will automatically turn from its connection with the pinion F, or may be turned by the operator to the position seen in full lines, Fig. 3.

The cross-head T attached to the bed o r foot plate A is turned at or near its center to form a bearing, e, between shoulders f, and the lower end of the case, suitably divided as a plummer-box, is fitted to the cylindrical portion e, and the case is held in adjusted position, either vertical or inclined, as may be desired, by means of a set-screw,'h. This construction of the cross-head enables me with one bearing to accomplish all that has heretofore been accomplished by two journals and ed. The crank is set in the head at variable Y lengths by means of a set-scremn.

It will be'noticed that the shaft E has but a single gear upon it-viz., the onefwhich drives the auger-spindle-and it is this gear with which the rackis made to en gage to draw the auger upward.

I am aware that it is not new to provide the drivingshaft with an independent toothed wheel or pinion which is engaged by a nuova ble rack when it is desired to elevate the auger, and also that a compound toothed and .2. In a boring-machine, the` pivoted rack and its locking device to retain the rack-teeth in engagement with the auger-driving pinion on the main shaft, combined with the augerdriving pinion F, whereby, by a movement of the drivingshaft and pinion F in a direction the reverse of that in boring, the said rack is liberated from the locking device and the said pinion, substantially as described.

JAMES SWAN.

Witnesses F. A. RUGG, H. S. HALLIGAN. 

